Razor-blade-grinding machine.



No. 851,057. PATENTED APR-23,1907.

F.W.BLASBERG. V

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F. w.; BLASB-ERG. RAZOR BLADE GRINDING MACHINE.

.APPIJIOATION FILED APR.2, 1904.

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, FRIEDRICH WILHELM BLASBERG, OF HAAN, GERMANY.

RAzOR-BLADE-GFllNDlNG MACHINE.

No. 851,057. Specification of Letters Patent.

Patented April 23, 1907.

Application filed April 2, 1904. Serial No. 201,291.

To all whom it may concern:

Be it known that I, FRIEDRICH WILHELM BLASBERG, a subject of the Emperorof Germany, and a resident of Haan, Province of the Rhine, in the Empireof Germany, have invented certain new and useful Improvements in orRelating to Razor-Grinding Machines, of which the following is aspecification.

The present invention relates to a new compound motion of theblade-support and to spring-controlledlaterally-adjustable bearings forthe spindles of grinding-rolls in razorgrinding machines.

A razor-grinding machine according to this invention is illustrated, byway of eX- ample, in the accompanying drawings, of which Figure 1 showsa razor-grinding machine according to this invention in side elevation.Fig. 2 shows a front elevation of the same, partly in section. Fig. 3 isa cross-sectional view on the line A A of Fig. 1; Fig. 4, a section onthe line B- B of Fig. 1; Fig. 5, a section on the line C C of Fig. 4,and Fig. 6 a section on the line D D of Fig. 1. Fig. 7 is a plan of thepart of the machine shown in Fig. 6; and Figs. 8 and 9 show,respectively, the paths of a point of the blade in hitherto existinggrinding-machines and in a grindingmachine according to this invention.

The hollow grinding of razor-blades used to be effected on the machineshitherto used by causing the blade-support to swing to and froin an arcof circle between the grindingrolls and by gradually advancing them inthe plane of oscillation either by hand or automatically. The path thustraveled by a point on the blade is illustrated in Fig. 8. Thiscomplicated and tedious process has been greatly simplified andshortened by the construction according to this invention by combiningthe total amount of the gradual advance with the circular movement ofthe blade support. While the said support swings once to and fro in anarc, the advance simultaneously takes place by an up-anddown movement ofthe blade-support in vertical direction. Owing to this, each point ofthe blade will describe a curved path, as shown in Fig. 9.

In order to facilitate the removal and introduction of the blade betweenthe grindingrolls, these rolls are made laterally movable by means oftwo double levers actuated by rods operated by treadles.

In order to bring about the double movement of the blade-supports, whichis one of the features of this invention, a pulley 36 is mounted inproximityto the driving-pulley 26 on the main shaft 25, supported underthe machine-bed, the said pulley 36 transmitting motion to a pulley 38,carried by a depending bracket 37. Another pulley 39, mounted on thesame spindle as the pulley 38, drives a ulley 40, mounted on the spindle42 of the ell-crank lever, by means of the belt 43.

The bell-crank lever 29, carrying the bladesupport 30, has its fulcrumin an eccentric 41 and is caused to move by the latter, the free arm ofthe bell-crank lever being connected to an eccentric 27 of the mainshaft 25 by means of an intermediate rod 28. The eccentric 27 causes theblade-support 30, and therefore the blade 31, to move in an arc of acircle. (Shown dotted in Fig. 5.) The pivot-pin 42 of the bell-cranklever 29 under the influence of the two eccentrics 27 and 4]. describesan elliptical path, and thus causes the blade to travel in a path suchas that shown in Fig. 9. The number of the up-anddown movements of theblad e-support caused by the eccentric 41 depends on the width of thegrinding-stones and is determined by the circumstance that each point ofthe blade must once come into contact with the grinding-stone when inits highest position. The length of the arc movement can be modified asdesired, to which end the eccentric parts are adjustable and movable onthe shaft 25, Fig. 4. The whole bearing 45 of the bellcrank lever can bevertically adjusted by means of a screw 44 and hand-wheel 43, so thatblades of various width can be ground.

The driving of the grinding-rolls is effected l by. means ofbelt-pulleys 4, supported in a double head-stock 3.- The bearings 9 ofthe spindles of the grinding-rolls are arranged in special guide-tubes.On a transverse bed 5 are arranged on the left and right hand sidehead-stocks 6, each provided with two bearings and supporting which areguided bearings 9 for the spindles of the grinding-rolls. The spindlesare acted upon by the inner helical springs 8. These tubes are providedwith covers 10, through which project screw-spindles 11, which effectthe alteration of the force of the springs. Each screw is provided witha hand-wheel 12.

The following device allows of the accurate setting of thegrinding-rolls 18 for various 3 shapes of blades, as well as adjustmentto two tubes 7, in

compensate for the wear of the grinding rolls. In two supports 13,arranged on the tubes 9, carrying the spindles of the grinding-rolls,are mounted, by means of sleeves 14, a spindle 15, provided with a leftand right hand screw-thread and moved by a hand-wheel 17, supported inthe fork 16, Fig. 6. The bearings 9 of the grinding-roll spindles urgedtoward one another by the springs 8 can be moved. apart by turning thehand-wheel 17, the sleeves 14 causing the supports 13 to move laterallyin the direction of the arrows, so that the grinding-rolls 18 can be setin an accurate manner. The bearings 9 of the grinding roll spindles,with the grinding-rolls, can be pulled out b means of two levers 19,pivoted to the said bearings 9 and operated, by means of rods 20, by atreadle-lever 23, pivoted on the pin 21 and sliding in the slot of aguide 22 for the purpose of-enabling the blades to be interchanged, thesupports 13 sliding on the sleeves '14, the projections of which form astop and prevent the springing back of the bearings.

What I claim as my invention, and desire to secure by Letters Patent, is

1. A razor-blade grinding-machine comprising a driving-shaft, aneccentric, means for operating said eccentric from said driving-shaft, abell-crank lever having its fulcrum on said eccentric, a razor-bladecarrier on one arm of said lever, means intermediate the other end ofsaid lever and the drivingshaft for imparting a rocking motion to therazor-blade carrier and means for raising or lowering the position ofsaid eccentric substantially as set forth.

2. In a razor-blade-grinding machine of the kind described a pair ofgrindingrolls, shafts carrying said rolls, tubular guides for saidshafts and pivoted levers connected to 'said shafts and to a treadledevice, substantially as set forth.

3. A razor-blade-grinding machine of the kind described comprising adriving-shaft, an eccentric, means fordriving said eccentric from saiddriving-shaft, a razor-carrier, a bell-crank lever supporting saidcarrier and fulcrumed in said eccentric, means for raisl ing or loweringthe pivot of said bell-crank lever, an eccentric on said driving-shaftoperating the free end of the bell-crank lever, and a pivoted levercarrying the supportingshaft of the grinding-roller and means foradjusting the grinding-rollers toward or from each other substantiallyas set forth.

4. In a razor-blade grinding-machine of the kind described,grinding-rolls mounted on shafts 9, tubular bearings for said shafts andsprings and adjustable screws for regulating the position of thegrinding-rolls, substantially as described.

| In testimony whereof I have signed my nameto this specification in thepresence of two subscribing witnesses.

FRlEDRIOH WILHELM BLASBERG. Vitnesses:

I P. HERRMANN,

, VICTOR W. HELDT.

